Extensible rocking board



(No Model.)

N. P. BENSON.

' EXTENSIBLE ROCKING BOARD.

No. 451,994. Patented May 12,1891. 1

' WITNESSES:

Z BY

4; A TTORNE Y INVENTOR UNITED STATES 1ATE T OFFICE.

NILS PETER BENSON, OF DENVER, COLORADO.

EXTENSIBLE ROCKING BOARD.

SPECIFICATION forming part of Letters Patent No. 451,994, dated May 12,1891.

Application filed July 1, 1889- $erial No. 316,215. (No model.) I

T at whom it may concern.-

Be it known that I, NILs PETER BENSON, a citizen of the United States,residing at Denver, in the county of Arapahoe and State of Colorado,have invented certain new and useful Improvements in Extensible RockingBoards; and I do declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the figures of reference markedthereon, which form a part of this specification.

My invention relates to an improved extensible rocking board of theclass designed for outdoor amusement and exercise, in the use of whichone or more persons sit on each end of a balance-support provided withrockers resting upon a suitable stationary platform to which they areproperly secured.

The object, therefore, of my improvement is to provide a device of theclass stated which shall be simple, durable, and safe; to which ends myinvention consists of the features hereinafter described and claimed,and illustrated in the accompanying drawings, in which- Figure 1 is anelevation, partially in section, of my improved device. Fig. 2 is avertical section taken on line a; m, Fig. 1. plan view of one end of mydevice.

In the drawings, the reference-numeral 1 indicates a suitable stationaryplatform to which is fastened the upright loops 18. Upon this platformrest the rockers 2 2, provided with pins 3 3, centrally secured to theoutside of each, said pins being confined within the loops 18, as shown.

Secured to the outside of each rocker by means of screws, bolts,mortising, or in any suitable manner, are the standards at, which areattached at their upper extremities to stationary guide-beams 5, towhich are fastened both at the top and bottom the metal plates 15 15,forming inner guideways for the reception of sliding bars 7 7, of whichthere are four in number, two on each end of the (le vice, their innerextremities meeting in the center when the bars 7 or the frames whichFig. 3 is a.

compose them are closed or when the device occupies the least possiblespace. These sliding bars are also furnished with metal plates 15 at topand bottom, to give strength and durability, and also to lessen thefriction incidentto moving within the guideways. One of each pair of thesliding bars 7 is somewhat longer than the other. To the top of theouter extremity of 'each of the longer bars is fastened one end of theseat-board 6, the op posite end of said board being supported by oneextremity of a metal brace 14:, which curves downward, forming a step toassist a person in reaching the seat-board. The other end of said braceis fastened to the under side of the shorter sliding bar, as shown. Infront of each seat-board, within easy reach thereof and supported bystandards resting upon sliding bars 7, is the hand-piece 8. Attached tothe sliding bars and extending downward in front of the seat-board isthe footrest 9. Near the inner extremities of each pair of said slidingbars 7 is a rod 10, one extremity of said rod being made fast to theinside of one of the bars 7, the other extremity being threaded andadapted to enter the other bar, which is provided with a suitable socketfor its reception. The threaded extremity of each rod 10 is providedwith a nut having a lever 11, between which and the adjacent bar is awasher 12. By turning levers 11 sliding bars 7 may be tightened orloosened within their grooved ways, as maybe desired. Near one extremityof each guide-beam 5, and fastened to the under side thereof, is a hook13. These hooks are turned up on the inside of their adjacent slidingbars 7 as guides to the bars 7, and also prevent them from slidingentirely out during extension, since a plate 16 at the foot of each rod10 comes in contact with said book, which is placed at the limit ofextension. There is a brace 17 connected with beams 5, said brace beingcentrally located and elevated sufficiently to allow free access tosecure levers 11, whatever the position of the sliding frames formed bybars 7 and their connections.

Having thus described my invention, what I claim is-- The combination,with the rocking frame having two bars of unequal lengths upon each Intestimony whereof I affix my signature in of its ends, of a seat restingupon the end of presence of two witnesses. each of the longer bars ofeach side, and a metal brace having a depressed central portion andhaving its opposite ends secured to the shorter bar and to the seat ateach end of the frame, forming a step, as described.

NILS PETER BENSON.

Witnesses:

L. F. WILBER, FRED. W. FELDWISOH.

